Strauch R J, Rosenwasser M P, Lunt J G
Department of Orthopaedic Surgery, Columbia-Presbyterian Medical Center, New York, NY 10032, USA.
J Hand Surg Am. 1998 May;23(3):519-23. doi: 10.1016/S0363-5023(05)80471-X.
Spiral and oblique metacarpal shaft fractures frequently develop shortening through the fracture site. The acceptable amount of fracture shortening has not been well established. The goal of this study was to elucidate the acceptable limits of metacarpal shaft fracture shortening in a cadaver model by assessing the magnitude of the metacarpophalangeal (MCP) joint extensor lag produced. Nine fresh-frozen cadaver hands were used to create a metacarpal shaft fracture model in the second and fifth metacarpal bones. Sequential shortening up to 10 mm in 2-mm increments was performed. The results revealed an average of 7 degrees of extensor lag at the MCP joint produced for every 2 mm of metacarpal shortening. The capacity of the MCP joint for active hyperextension may compensate for the extensor lag produced by metacarpal shortening in the clinical setting.
掌骨干螺旋形和斜形骨折常出现骨折部位的短缩。可接受的骨折短缩量尚未明确确定。本研究的目的是通过评估所产生的掌指（MCP）关节伸肌滞后程度，阐明尸体模型中掌骨干骨折短缩的可接受限度。使用9只新鲜冷冻尸体手在第二和第五掌骨创建掌骨干骨折模型。以2毫米的增量依次短缩达10毫米。结果显示，掌骨每短缩2毫米，MCP关节平均产生7度的伸肌滞后。在临床环境中，MCP关节主动过伸的能力可能会补偿掌骨短缩所产生的伸肌滞后。
